81299720

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{89}}^1\times {\mathrm{557}}^1$

素因数の和:698

約数の個数: 64

約数和(自身を含む): 189831600

約数和(自身を除く): 108531880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 89, 164, 178, 205, 328, 356, 410, 445, 557, 712, 820, 890, 1114, 1640, 1780, 2228, 2785, 3560, 3649, 4456, 5570, 7298, 11140, 14596, 18245, 22280, 22837, 29192, 36490, 45674, 49573, 72980, 91348, 99146, 114185, 145960, 182696, 198292, 228370, 247865, 396584, 456740, 495730, 913480, 991460, 1982920, 2032493, 4064986, 8129972, 10162465, 16259944, 20324930, 40649860, 81299720]

約数ペア:

[(1, 81299720), (2, 40649860), (4, 20324930), (5, 16259944), (8, 10162465), (10, 8129972), (20, 4064986), (40, 2032493), (41, 1982920), (82, 991460), (89, 913480), (164, 495730), (178, 456740), (205, 396584), (328, 247865), (356, 228370), (410, 198292), (445, 182696), (557, 145960), (712, 114185), (820, 99146), (890, 91348), (1114, 72980), (1640, 49573), (1780, 45674), (2228, 36490), (2785, 29192), (3560, 22837), (3649, 22280), (4456, 18245), (5570, 14596), (7298, 11140)]